Stop in for a cup of coffee

that is what is in the wagon now that someone put in ....I want to take it out of the wagon and put it in my 75 dart to make a 360/833 od / 8 1/4 combo ...then for the wagon ...get some kind of readily available rear ...even a ford what ever to make a /6/ 833 od / some kind of rear end that can tow a light trailer with combo